Electrochemical performance of nickel/metal hydride batteries under unconventional conditions and degradation analysis

来源期刊：中国有色金属学报(英文版)2004年第1期

论文作者：李丽 吴锋 杨凯 王敬 陈实

文章页码：208 - 214

Key words：Ni/MH battery; electrode materials; degradation; cycle life

Abstract: The charge-discharge performance and cycle stability of D size Ni/MH batteries at -20℃, 25℃and 55℃were examined. The results show that the decline rate of Ni/MH battery discharge capacity at -20℃and 55℃are 12.1% and 13.6%,and the average discharge voltage decreases by a value of 0.13 V and 0.06 V respectively, cycling stability declines obviously at various temperatures. The capacity degradation of Ni/MH batteries under low temperature is reversible, belonging to transient degradation and that of high and normal temperatures are not reversible, belonging to permanent degradation. Electrochemical impedance spectroscopy, scanning electron microscope and energy dispersive X-ray analyzer were introduced to study the main causes of cycling deterioration of Ni/MH batteries.